======================================
| [   12.123320][  T478] softirqs last disabled at (9882): __alloc_skb (./include/linux/bottom_half.h:20 (discriminator 2) net/core/skbuff.c:697 (discriminator 2))
| [   12.123322][  T478] Preemption disabled at:
| [   12.123323][  T478] vprintk_emit (kernel/printk/printk.c:2471)
| [   12.123332][  T478] Tainted: [W]=WARN
[   12.123333][  T478] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.123334][  T478] Call Trace:
[   12.123336][  T478]  <TASK>
[   12.123337][  T478]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   12.123343][  T478]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   12.123345][  T478]  __might_resched.cold (kernel/sched/core.c:9234)
[   12.123349][  T478]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   12.123352][  T478]  ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439)
[   12.123357][  T478]  __kmalloc_noprof (./include/linux/sched/mm.h:322 (discriminator 2) mm/slub.c:4636 (discriminator 2) mm/slub.c:4974 (discriminator 2) mm/slub.c:5413 (discriminator 2) mm/slub.c:5439 (discriminator 2))
[   12.123360][  T478]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   12.123366][  T478]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:58 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[   12.123369][  T478]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   12.123372][  T478]  put_chars (drivers/char/virtio_console.c:1176)
[   12.123375][  T478]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   12.123379][  T478]  ? validate_chain (kernel/locking/lockdep.c:159 kernel/locking/lockdep.c:191 kernel/locking/lockdep.c:3928)
[   12.123384][  T478]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   12.123387][  T478]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   12.123389][  T478]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   12.123394][  T478]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   12.123395][  T478]  ? console_emit_next_record (kernel/printk/printk.c:3095 (discriminator 2) kernel/printk/printk.c:3182 (discriminator 2))
[   12.123398][  T478]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   12.123401][  T478]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   12.123405][  T478]  console_emit_next_record (kernel/printk/printk.c:3183)
[   12.123408][  T478]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   12.123410][  T478]  ? console_flush_one_record (./include/linux/rcupdate.h:314 (discriminator 2) ./include/linux/srcu.h:439 (discriminator 2) kernel/printk/printk.c:291 (discriminator 2) kernel/printk/printk.c:3246 (discriminator 2))
[   12.123412][  T478]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   12.123414][  T478]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   12.123418][  T478]  console_flush_one_record (kernel/printk/printk.c:3268)
[   12.123422][  T478]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   12.123423][  T478]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   12.123429][  T478]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   12.123431][  T478]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   12.123432][  T478]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   12.123434][  T478]  ? lock_acquire (kernel/locking/lockdep.c:5913)
[   12.123438][  T478]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   12.123440][  T478]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   12.123443][  T478]  vprintk_emit (kernel/printk/printk.c:2479)
[   12.123446][  T478]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   12.123449][  T478]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   12.123450][  T478]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   12.123455][  T478]  _printk (kernel/printk/printk.c:2504)
[   12.123458][  T478]  ? snapshot_read.cold (user.c:?)
[   12.123460][  T478]  ? ___ratelimit (lib/ratelimit.c:97 (discriminator 3))
[   12.123464][  T478]  ? nf_conntrack_find_get (./include/net/netfilter/nf_conntrack_zones.h:61 (discriminator 1)) nf_conntrack
[   12.123474][  T478]  ? idr_get_free (??:?)
[   12.123476][  T478]  ? net_generic (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) ./include/net/netns/generic.h:48 (discriminator 2)) nf_conntrack
[   12.123484][  T478] __nf_conntrack_alloc.cold (net/netfilter/nf_conntrack_core.c:1671 (discriminator 3)) nf_conntrack
[   12.123491][  T478] ctnetlink_create_conntrack (net/netfilter/nf_conntrack_netlink.c:2235) nf_conntrack_netlink
[   12.123494][  T478]  ? __nf_conntrack_find_get (./include/linux/seqlock.h:75 (discriminator 6) ./include/net/netfilter/nf_conntrack.h:343 (discriminator 6) net/netfilter/nf_conntrack_core.c:762 (discriminator 6) net/netfilter/nf_conntrack_core.c:798 (discriminator 6)) nf_conntrack
[   12.123501][  T478]  ? nf_conntrack_find_get (net/netfilter/nf_conntrack_core.c:830 (discriminator 1)) nf_conntrack
[   12.123506][  T478]  ? ctnetlink_conntrack_event (net/netfilter/nf_conntrack_netlink.c:866) nf_conntrack_netlink
[   12.123509][  T478]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[   12.123511][  T478]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   12.123514][  T478]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   12.123517][  T478]  ? nf_conntrack_find_get (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) net/netfilter/nf_conntrack_core.c:842 (discriminator 2)) nf_conntrack
[   12.123525][  T478] ctnetlink_new_conntrack (net/netfilter/nf_conntrack_netlink.c:2429) nf_conntrack_netlink
[   12.123528][  T478]  ? ctnetlink_create_conntrack (net/netfilter/nf_conntrack_netlink.c:2332) nf_conntrack_netlink
[   12.123530][  T478]  ? ww_mutex_lock (kernel/locking/mutex.c:934)
[   12.123533][  T478]  ? nla_get_range_signed (lib/nlattr.c:270)
[   12.123538][  T478]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[   12.123547][  T478]  ? ctnetlink_create_conntrack (net/netfilter/nf_conntrack_netlink.c:2332) nf_conntrack_netlink
[   12.123549][  T478]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   12.123554][  T478]  nfnetlink_rcv_msg (net/netfilter/nfnetlink.c:300)
[   12.123561][  T478]  ? nfnetlink_bind (net/netfilter/nfnetlink.c:152 (discriminator 5))
[   12.123564][  T478]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[   12.123566][  T478]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   12.123577][  T478]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4116 (discriminator 3) kernel/rcu/tree.c:4108 (discriminator 3))
[   12.123579][  T478]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   12.123582][  T478]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   12.123587][  T478]  netlink_rcv_skb (net/netlink/af_netlink.c:2556)
[   12.123589][  T478]  ? nfnetlink_bind (net/netfilter/nfnetlink.c:152 (discriminator 5))
[   12.123593][  T478]  ? netlink_ack (./include/linux/skbuff.h:2718)
[   12.123594][  T478]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[   12.123600][  T478]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[   12.123606][  T478]  nfnetlink_rcv (net/netfilter/nfnetlink.c:667)
[   12.123609][  T478]  ? nfnetlink_rcv_batch (./include/linux/netlink.h:18)
[   12.123611][  T478]  ? netlink_deliver_tap (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) net/netlink/af_netlink.c:341 (discriminator 2))
[   12.123614][  T478]  ? netlink_deliver_tap (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) net/netlink/af_netlink.c:341 (discriminator 2))
[   12.123616][  T478]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[   12.123620][  T478]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[   12.123625][  T478]  netlink_sendmsg (net/netlink/af_netlink.c:1900)
[   12.123629][  T478]  ? netlink_unicast (./include/net/net_namespace.h:422 (discriminator 7))
[   12.123632][  T478]  ? __might_fault (mm/memory.c:7482 (discriminator 5))
[   12.123636][  T478]  ? _copy_from_user (./include/linux/instrumented.h:146 ./include/linux/uaccess.h:184 lib/usercopy.c:18)
[   12.123640][  T478]  __sys_sendto (net/socket.c:800 (discriminator 4) net/socket.c:815 (discriminator 4) net/socket.c:2281 (discriminator 4))
[   12.123644][  T478]  ? __ia32_sys_getpeername (net/socket.c:2235)
[   12.123657][  T478]  __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)
[   12.123659][  T478]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   12.123663][  T478]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488)
[   12.123666][  T478]  ? do_syscall_64 (arch/x86/entry/syscall_64.c:81 (discriminator 44))
[   12.123668][  T478]  do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
[   12.123670][  T478]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[   12.123673][  T478]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   12.123675][  T478] RIP: 0033:0x7f3e6875554e
[   12.123678][  T478] Code: 4d 89 d8 e8 b4 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 b4 bd 00 00       	call   0xbdbc
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[   12.123680][  T478] RSP: 002b:00007fffc74f1330 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   12.123683][  T478] RAX: ffffffffffffffda RBX: 00007fffc74f2390 RCX: 00007f3e6875554e
[   12.123684][  T478] RDX: 000000000000008c RSI: 00007fffc74f2390 RDI: 0000000000000005
[   12.123685][  T478] RBP: 00007fffc74f1340 R08: 00007f3e68902980 R09: 000000000000000c
[   12.123686][  T478] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffc74f2390


Finger prints:
__alloc_skb:vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars